Edwabd da vies



E. DAVIES.-

ALARM 0LO0K.

(Model.)

Patented Aug. 26, 1 884.

INVBNTOR M ATTOR YS.

plied thereto.

UNITED STATES PArn'r tries.

EDWARD DAVIES, OF BROOKLYN, NEXV YORK.

ALARM- CLOCK.

EBPEC'IFIGATION forming part of Letters Patent No. 304,080, dated August26,1884. Application filed January 24, 1884. (Model.)

To aZZ whom it may concern:

Be it known that I, EDWARD DAVIES, of Brooklyn, in the county of Kingsand State of New York, have invented certain new and useful Improvementsin Alarm-Clocks, of which the following is a specification.

This invention relates to an improved alarmclock of that class in whichthe mainspring is employed for actuating the time-movement of the clockas well as the alarm mechanism of the same, the means employed for thispurpose being of simple construction, and so arranged as to be withinview, whereby the irregular functioning of the alarm mechanism isavoided.

The invention consists of an alarm drivingwheel placed loosely upon saidarbor and taken along by a pawl-and-ratehet device, a pinion keyed tothe winding-arbor and meshing with a stop-gear wheel, that is providedat one part of its circumference with segmental tooth and adjoiningthereto with a recess of larger size. A spring attached to the rear wallof the clock-frame engages apin upon the stop-gear wheel, and causes thelatter to skip the teeth of the pinion when the mainspring is wound up,so that the pinion and its stop-gear are in a position to admit theworking of the alarm-movement when the alarm is liberated.

In the accompanying drawings, Figure 1 represents a sectional sideelevation of an alarmclock with my improved alarm mechanism ap- Fig. 2is a rear elevation of the clock-movement. Fig. 3 is a vertical transverse section through the mainspring, showing the winding-arbor andalarm stopmotion;'

and Figs. 4 and 5 are detail views of the alarm stop-motion, showing itrespectively in position after the alarm has been sounded and inposition ready for starting.

Similar letters of reference indicate corresponding parts.

A represents the movement of an alarmclock of that class in which themainspring is employed for actuating the time and alarm movements. B isthe winding-arbor, and O the mainspring, the inner end of which isattached to the arbor, while the outer end is attached in the usualmanner, by a stud or other fastening device, to the main drivingwheel Dof the time-movei'nent The main drivingwheel D is loose upon the arborB, so as to turn freely thereon in'following the expansion of themainspring 0, but connected thereto by the usual pawl and ratchet-wheel.On the other side of the mainspring is located upon the arbor B thedrivingwheel E of the alarm-movement. This wheel is also loose upon thearbor B, but connected thereto by a pawl, c, which is pivoted to thewheel E, and kept by a spring in engagement with a fixed ratchetwheel,f, on the winding arbor B. Then the arbor B is turned so as to wind upthe mainspring O, the ratchet-wheel f skips past the pawl e, while, whenthe winding is interrupted, the pawl c engages the ratchet f, and checksthereby the unwinding of the spring. To the winding-arbor B is furtherkeyed a pinion, F, which meshes with a stopgear, F, that is looselymounted on a short 1ndependent shaft, F, that is secured to theclock-frame. The gear-wheel Fis provided at one point of itscircumference with segmental tooth g of nearly twice the length of acommon tooth, and adjoining thereto with a recess, h, which latter isformed by breaking out a tooth on the circumference of the gearwheel.The segmental tooth g forms the stopping-tooth of the alarm stop-motion,while the recess h, adjoining the stop-tooth g, permits the turning ofthe arbor B, when the mainspring is wound up,withoutbeing blocked by thestop-tooth g.

To keep the teeth of the stop gear-wheel F in mesh with the teeth of thepinion F, a spring, t, that is attached to the rear wall of theclock-frame, presses by its free end on a latter into mesh with thepinion F, as shown in Figs. 2 and 5. Each tooth of the pinion moves thestop-gear F far enough so that the tooth of the stop-gear next to therecess h is cleared, after which said tooth isgmoved by the spring 2 andpin 1; into contact with the next following tooth of the pinion F, asindicated in Fig. 5. The stopgear F does not therefore interfere withthe winding up of the clock.

Any well-known alarm setting and liberating devices may be used inconnection with my improved stop-motion, which devices re- 1 quire nospecial description. Whenever the l alarm is liberated at the time forwhichthe a pin, 2', of the stop-gear F and returns the same has been setby the mechanism arranged for this purpose, the main driving-wheel. E ofthe alarm-movement actuates the train ofgcarwheels which oscillate thehammer that is fast 011 the pallet-spindle of the escapement-wheel ofthe alarm-movement, sothat the gong is sounded. The action of the innerend of the mainspring O on the arbor B and the alarm driving-wheel Erotates the latter and turns simultaneously thepinion F. This pinion,bein g in mesh with the stop gear-wheel F, turns the same in thedirection of the arrow shown in Fig. 5 until the stop-tooth g abutsagainst one of the teeth of the pinion F, as shown in Fig. 4, and causesthereby the stopping of the alarm movement. The stop-gear wheel Fremains in this position untilbythenext winding up of the clock thepinion F is turned in the direction of the arrow marked thereon in Fig.-;l-, whereby the intermeshing stop-gear wheel F is returned from theposition shown in Fig. lto the position shown in Fig. 2. In continuingto wind up the mainspring the springacted stop-gear ships the teeth ofthe pinion F, as indicated in Fig. 5, until the spring is entirely woundup, leaving the pinion F and stop-gear F in a position for allowing thealarm-movement to be actuated whenever the alarm is liberated. Thealarmmovement continues to act during the time in which the stop-tooth gmoves around from a position at one side of the pinion F to its positionat the other side of the same, when the looking oi" the pinion]? by thestop-tooth g, and thereby the stopping of the alarm-movement, takesplace. The action of the alarmmovcment, and consequently the unwindingof the inner end of the mainspring, is thereby restricted to thedistance through which the stop-tooth 9 travels until it comes around toits stopping contact with the teeth of the pinion F, as shown in Fig. 4.

It will be seen that the alarm-movemcnt is restricted to less than asingle turn of the arbor B, so as to require but a small portion of theforce of the mains n'ing to actuate the alarm-1novement. If it isdesired to use even a smaller part of the power of the mainspring, thesolid portion y is extended along a greater part of the circumference ofthe stop-gear F,

whereby the action of the alarm-movement is restricted to a fractionalpart of a rotation of the alarm driving-wheel 15.

In my improved alarm stopanotion the ringing of the gong is not confinedto one entire alarm driving-wheel, or to a fractional rotation of thesame; but the alarm may be kept striking for several turns of the alarmdriving-wheel by simply establishing the proper porportion of the numberof teeth of the pinion to the number of teeth of the stop-gear. If, forinstance, the pinion has six and the stop-gear twelve teeth, the alarmwill be kept ringing for two turns of the driving-wheel, while with [ourtcethof the pinion and twelve of the stop-gear the alarm will. becontinued for three turns of the driving-wheel and so on. When thealarm-movement is started and has completed its motion, it is stoppedpositively and uniformly by the stop-tooth 1 when itabuts against theteeth of the pinion.

The resetting of the stop-gear F into a position to admit the operatingof the alarmmovement is accomplished by winding up the clock, as beforedescribed.

I prefer to arrange the alarm slop-motion, composed of the pinion F,stop-gear F, and spring 15, on the outside of the clock-frame, as shownin Fig. 2, instead of at the inside,wl1ereby said gears can readily beseen and any irregular position be readily corrected.

Having thus described my invention, I claim as new and desire to secureby Letters Patcnt- The combination, with the winding-arbor l3,mainspring G, and alarm driving-wheel lil, connected by pawl and ratchetto the wint'ling-arbor, ot' a pinion, F, keyed to the winding-arbor, astop-gear, F, meshing with the pinion, and having an enlarged tooth q,an adjoining space, 71, and a pin, '5, engaged by a spring, 2', attachedto the clock-frame, substantially as and for the purpose set forth.

In testimony that I claim the loregoi ng as my invention I have signedmy name in presence of two subscribing witnesses.

EDWABD DAVIES.

